It seems Batman: Arkham City will not use Games for Windows LIVE, after all, as GreenManGaming tweets: "We've just received notice from Warner's that Batman is Games for Windows but NOT a Games for Windows 'Live' title!" The box art for the stealth/action sequel was revealed in June showing the GFWL logo, suggesting the game would use Microsoft's service, like Batman: Arkham Asylum did. Thanks Eurogamer.

GreenManGaming also lists Batman AA as not being able to be traded in, giving reason to believe it will be tied to some sort of client. Batman AA's publisher, Warner bros., used steamworks for it's last two PC releases (Bastion and FEAR 3) soooo.....